Grinding mill



GRINDING MILL I Fil ed Nov. 16. 1921 2 Sheets-She 1 '21 a0 as I5 la no is a2. I? 3 as aswas as" 35 0 37 4 as as .47 5g 46 5| 25 43 4? 4a 40 '59 42. 7

Inventors. William A. Gnbson ,rnes E. Needhum y My W Aflys;

W. A. GIBSON ET AL enmnme mm.

Filed Nov. 16. ,1921 l 2 Sheets-Sheet 2 Fig. 2. 7

. Ihvenlors. William A. Gibson Charles E. Needham mmlg Patented Au. 28, 1923.

aren't .r cs.

WILLIAM A. GIBSON AND CHARLES E. NEEDHAIII, OF ALLELlTOWN, PEN'NSYIJTALTIA,

ASSIGNORS TO BRADLEY PULVERIZER COMPANY, OF BOSTON, MASSACHUSETTS,

A CORPORATION OF Iv'IAINE.

, Germaine MILL.

Application filed November 16, 192 1. Serial no; 515,510.

To all whom it may concern:

Be it known that we, WILLIAM 'A. GiBsoN and CHARLES E. NEEDHAM, both citizens of the United States, and residents of Allentown, county of Lehigh, State of Pennsyl- Vania, have invented an Improvement in Grinding Mills, of which the following description, in connection with the accompanying drawing, is a specification, like 10 characters on the drawing representing like parts. i r y This invention relates toimprovements in grinding mills of the centrifugal type in which a gyratory roll suspended from a driving shaft cooperates with a horizontal grinding ring. The general object of the invention is to provide improved means for driving and lubricating the roll actuating mechanisms. V

More specifically, the invention relates to improvements in grinding mills of the type disclosed in the prior Patents No. 1,048,307, Edwin C. Griffin, granted December 12, 1912, .No. 1,095,986, Charles: E. Needham, granted May 5, 1914, and No. 1,262,379, Charles E. Needham, granted April 9, 1918.

In grinding mills of this type, the gymtory roll which cooperates with the horizontal grinding ring has been suspended upon a universaljoint located within the driving element which heretofore has been in the form of a pulley. This pulley has been provided with a downwardly extended hub which formed a part of the universal V joint, through which the shaft of the gyratory grinding roll was supported and actuated. ,7 i One of the obj ects of the present invention is to provide a construction in which the 40 universal" joint is removed from the driv ing element, preferably being located at a dist-anceebelow'the driving element, and in such position as to be readily accessible for repair. This is particularly important since the universal joint is practically the only feature of the mill aside from the grinding roll and die, which need-s repair or replacement.

In the grinding mills heretofore construc-ted, the driving pulley which contained the universal joint, has been located upon a vertical shaft, so that a vertical driving pulley has been always employed. By removing the universal joint from the driving element,

in accordance witlrtliepresent invention, any type of driving'mechanism may bemployed, such as a bevelled gear drive from a horizontalshaft, which 'may be rotated by a; horizontal .belt or by direct or indirect connection to a motorha-ving afhorizontal shaft. The construction is also "suclrthat if desired, a motor may be supported directly object of the invention is to promeans for lubricatingthe for excluding dust fro-m said universal joint.

A further object o'f the invention is to provide an improved systemfor lubricating the bearings of the driving shaft.

These and other objects and features of the invention will more fully appear from the following description and the accompanying drawings, and will'be pointed out in the claims. 7 A preferred embodiment of the "invention is illustrat-cd injthe' accom panying drawings, in which i i Fig. 1' grinding mill embodying the invention, certain portions being shown in elevation; .Fig. 2 isa front elevation of a grinding mill embodying the invention, showing amodified form of driving mechanism, in which th c main driving shaft of the mill is actuated through bevel gearing from a' hori zontalcountershaft; v Fig. 3 is a partial elevation of a grinding mill. embodying the invention, showing the drving shaft of the grinding mill asbeing actuated from an overhead motor directly connected to it. j I j 'A grinding mill comprising a preferred embodiment of the invention as illustrated in Fig. 1, consists of a bed, 1, having a pan 2 to receive the material to be ground,and a grinding ring 3; supported in the upper portion of said'pan against which the material is ground by a gyratory grinding-roll a, which is secured to the lower end of a shaft 5, which is connected at its upper end through a universal joint to a vertical driving shaftmounted in a super structure supabove the driving-shaft, and'connected there- 7 s a vertical sectional viewcfa ported from said base. The superstructure which supports the driving shaft and gyra tory roll shaft preferably is in the form of a U shaped frame 6 extending diametrically across the mill, and rests upon the upper ends of preferably A shaped standards 7, the lower ends of which are seated upon an extension or extensions 8 of the base 1. a

The upwardly extending members or arms of that! shaped frame support a saddle 9,

which is provided with an upwardly extend ingcentral boss 10, which receives and supports the upper bearing for the driving shaft. In the, preferred embodiment of the inven- .tion disclosed herein, this upper'bearing comprises a cylindrical member 11, provided with a central chamber having apreferahly spherically concaved lower wall 12 and a downwardly extending, Jreferably integral, sleevel having asuitable bushing 22 providing a journal for the driving shaft 14:.

7 20 having a central oil'inlet which preferably is covered by a suitable hinged cap 21. i It will'thus-be seen that the upper thrust bear- 7 ingis entirelysupported within the chamber 'byfthe bearingmember 11 which forms an oil receptacle adapted to contain a sufiicient amount of lubricant to submerge the thrust bearlng. I

The driving element desirably isconnected to the driving shaft a short distance below the upper bearing;

Various different types of drivingelements may bevprov'ided as will hereinafter more fully appear. 4 As illustrated in .Fig. 1. the .driving'element'is in the form of a pulley 23, the hub 24: of which 7 is secured to the driving shaft by a suitable key 25.

The upper face of the hubof the pulley desirably is provided with a flange 26 to which is secured a cone pulley 27 from which the feed mechanism of the mill is actuated; The cone pulley 27 desirably is hollow, and its base seats tightly upon; the upper face ofthe flange 26 of the hub of the driving element and provides anfoil chamber 28 which is adapted to receive any oil which may seep through the upper bearin for the driving, shaft.

d Desirably the inner wall of the cone'pulley converges upwardly so that the centrifugal action of the rotating driving element will 83 in the lower bearing.

illustrated the cone pulley surrounds the downwardly extending sleeve 13 of the upper bearing.

The lower bearing of the ClYlVlHg' shaft comprises a cylindrical member 30, preferably having a flange 81 which seats upon an annularboss 32 extending upwardly from the transverse web ofthe U-shaped superstructure 6.. An annular channel 33 desirably extends upwardly from the under face of the lower hearing so that a; sleeve-like bearing is provided for the driving shaft. The bearing member 30 preferably has an upwardly extending flange 35 which surrounds; the lower end of thehub 9A of the driving element and forms a well to which oil may be supplied in any suitable manner. This well also collects any oil which may seep downwardly through the'hub ofthe driving element A cup 36, to receive the oil which passes through the lower bearing, preferably is secured to the shaft with its wall 37 extending upwardly into the channel By reason of this construction any oil which passes through the lower bearing will be collected and re tained in said cup so that it cannot drop into the material which is being ground.

One of the principal features of the inven-' tion, as above stated, consists in providinga novel universal oint connection between the lower end of the drivin shaft and the u 3' Deiend of the shaft which carries the gy-ratory roll, said novel connection'being substan tially the reversal of the construction disclosed in the prior pate-nts' aforesaid.

In the' prcferred" construction illustrated erein a cross head 88 is secured to the tapered lower endoffhe driving shaftlI i by a nut 39', or other suitable fastening. This cross head is provided with trunnions' 4:0 which are journalledin seginentsfil which slidablyengage ways 42in the complementary member of the universal connection which carries the gyratory roll-carrying shaft, the construction of said segmentsand waysbeing similar to those illustratedin the v i patents aforesaid.

The complementary member ofthe univer sal coupling desirably isin the form of" an oblong chambered coupling nieinber' iid. having at its lower end a boss -which receives the tapered upper end of the .gyratory roll-carrying shaft 5 which is connected thereto by a key'4i5, or other suitable connection. Diametrically opposite recesses in the inner face of the wall of'the coupling member 43 forms seats for the'ways 42 which are engaged by .thesegm'ents 41. The

upperend of the'chambered coupling mem ber desirably is provided with an outwardly extending flange 46 to which a suitable head 47 is secured by bolts or otherfastenin'g.

replacement.

The head 47 is provided withan upwardly extending spherically curved flange i8, the under face of which is engaged'by a supporting plate 49 having a recessed under face which receives a wear plate 50 having a spherically curved under face which engages the convex surface of a hardened wear plate 51 which rests upon the cross head 38. By reason of this construction the weight of the roll, its shaft, and the chambered coupling member is carried by thewear plate 50 which is supported by the cross head of the driving shaft. The co-opcrating curved surfaces of the wear plates 50 and 51 enable the roll shaft to have a lateral swinging movement while the roll shaft is rotated upon its axis by the driving shaft through the cross head 38 and the complementary coupling member.

It will be observed that the chambered member of the universal coupling is closed at the bottom so that it provides a lubricant receptacle which may be packed with grease or oil, so that the universal coupling members may, if desired, be completely embedded in the grease or oil. coupling member desirably is provided with a dustcover 52 which has a spherically curved edge fitting in a complementary way formed between the supporting plate 49 and the upwardly curved flange 48 of the head. A helical spring 52 interposed between the dust cover 52 and the under surface of the cup 37 serves to retain the dust cover firmly in its seat within said way, and to exclude all dust from the universal joint notwithstanding the oscillatory movement of the chambered member of the coupling relative to the driving shaft. B reason of this construction the univer- 'sal joint may be located below the superstructure 6, in which the driving elements are jou naled, and consequently it maybe located within an open portion of the frame, where it is easily accessible for repair or The transverse members 53 of A-shaped standards, which serve to support the usual casing which encloses the grinding chamber and screens, may be solocated as to provide a higher and consequently a larger grinding chamber than has heretofore been employed.

In Fig. 1 of the drawing, the driving element for actuating the driving shaft is shown as a pulley.

Another of the principal features of the invention consists in so constructingthe grinding mill that it may be driven by various different types of mechanisms, which enables the machine to be readily installed in factories which are provided with different ty es of power mechanism.

By removing the universal coupling from the driving member, andsupporcing the The chambered same upon the driving shaft beneath the driving member, means have been provided by the present invention to enable such dif ferent driving mechanisms to be employed, certain of which are illustrated in Figs. 2 and 3 of the drawing.

In the construction illustrated in Fig. 2, the driving element comprises a bevelled gear 55, which is keyed to the driving shaft 14 in a manner above described. The" bevelled gear 55 is driven through a bevelled pinion 56 upon a counter shaft mountedin bearings 58, formed'in one of the vertical webs of the U-shaped superstructure. The counter-shaft may be rotated either by a" pulley 59 sec'ured to said shaft, or may be connected to the shaft of a motor 60 or other power transmitting means. Of course, either bevelled, spur or planetary gearing, or other types of powertransmitting mechanism may be employed for actuating the driving shaft. I V

In Fig. 3 a modified form of driving mechanism is illustrated, in which the upper end of the driving shaft 1a is provided with an extension 61., which is connected by a coupling (32 to anoverhead motor 63, and may be actuated therefrom either directly or through suitable power transmitting mechanism.

It will be understood that various moditications in form and construction, arrangement and design of parts may be made within the spirit andscope of the following claims.

Having thus described the invention, what we claim as new, and desire ,to secure by Letters Patent, is:

1 In a grinding mill of the class described comprising an overhead driving shaft, a

cross head forming a part of a universal coupllng fixedly secured to said driving shaft, a complementary universal coupling member engaging said cross head, and a depending shaft, carried by said comple melltal (Ill CIsd]. C01 pllilg 1118111061.

2; In a grinding mill of the class described comprising a vertical driving shaft, a thrust bearing; supporting the upper end of said driving of a universal coupling fixedly secured to the lower end of said driving shaft, a chambered complementary,coupling member engagingand enclosing said cross head, forming an oilreceptacle and a depending shaft carried by said chambered member.

3. In a grinding mill of the class described shaft, a cross head forming a part comprisinga vertical driving shaft, a thrust V D- 7 bearing supporting said driving shaft, a

cross head fixedly secured to the lower end of saiddriving shaft,"forming a part of a universal coupling, a hambered complementary universal coupling member engaging and enclosing cross head,'a head secured to said chambered coupling memher, cooperating universal bearing members on said driving shaft and said head acting to support said chambered coupling member, and a depending shaft carried by said chambered coupling member.

l. In a grinding mill of the class described, a vertical driving shaft, a thrust bearing supporting said driving shaft, a cross head fixedly secured to the lower end of said driving shaft, forming apart of a universal coupling, a chambered complementary universal coupling member engaging and enclosing said cross head, ahead secured to said chambered coupling member, a bearing member having a convex upper face secured to said driving shaft above said cross head, a complementary concave bearing member engaging the head of said chambered member, and a dependin shaft carried by said chambered member.

5. In a grinding mill of the class described comprising a vertical driving shaft, a thrust bearing supporting said driving shaft, a cross head fixedly secured to the lower end of said driving shaft, forming a part of a universal coupling, a chambered complementary universal Coupling member engaging and enclosing said cross head, a head secured to said chambered coupling member, a bearing member having a convex upper face carried by said driving shaft above said cross head, a complementary concave bearing member engaging the head of said chambered member, a dust cap fitting said driving shaft, having an edge portion engaging a complementary way on said head, and a gyratory shaft carried by said chambered member. r 6. In a grindingmill of the class described comprising a vertical driving shaft, a thrust bearing supporting said driving shaft, a cross head fixedly secured to the lower end of said driving shaft, forming a part of a universal coupling, a chambered complementary universal co ipling member engaging and enclosing said cross head, a head secured to said chambered coupling member, a bearing member'having a convex upper face carried by said driving shaft above said cross head, a complementary concave hearing member engaging the head of said chambered member, a dust cap fitting said driving shaft, having an edge portion engaging-a complementary way on said head, resilient means acting to retain said dust cap t1ghtly seated on sand," way, and a gyratory shaft carried by said chambered member.

7. In a grinding mill comprising a vertical driving shaft and a shaft connected to the lower end of said driving shaft'by a universal joint, a support-ingframe having upper and lower transverse members, a bearing for saidvdriving shaft carried by said upper transverse membericomprising an oil chamber to receive a thrust bearing, and a depending sleeve enclosing said shaft, a driving member secured to said driving shaft, having a receptacle to receive the oil which passes through said upper bearing, and a lower bearing for said shaft..

8. In a grinding mill comprising a vertical.

driving member secured to said shaft, a hollow power transmitting member located above said driving member and actuated thereby, adapted to recelve the 011 which passes through said upper bearing, and a bearing for said shaft in said lower transverse I member.

9. In a grinding mill comprising a vertiaal driving shaft and a shaft connected to the lower end of said driving shaft by a universal joint, a supporting frame having upper and lower transverse members, a hearing for said driving shaft carried by said upper transverse member, comprising an oil chamber to receive a thrust bearing, and a depending sleeve enclosing saidshaft, a driving member secured tosaid shaft having a receptacle to receive the oil which passes through said upper bearing, a lower bearing for said shaft, mounted in said lower transverse member, having a downward y extending sleeve embracing said driving shaft, means for supplying oil to said lower hearing and a cup enclosing said sleeve to receive 11 1e oil which passes through said lower bearing.

cal driving shaft and a gyratory shaft connected to the lower end of said driving shaft by a universaljoint, a supporting frame having upper and lower transverse 'mem' here, a bearing for said driving shaft carried by said upper transve se member, comprising an oil chamber to receive a'thrust bearing and 2, depen ing sleeve enclosing said shaft, driving member secured to said shaft having a receptacle to receive the oil which passes through said upper bearing, a lower bearing for said driving shaft mo-unted in'said lower transverse member having an upwardly extending flange surrounding the end of the hub ofsaid driving member and forming an 'oil receptacle, and provided with a downwardly extending sleeve embracing said driving shaft, and a cup enclosing said sleeve to receive the oil which passes through said lower bearing. 1

11'. In a grinding mill of the class described comprising la vertical driving shaft,

7 and a gyratory roll shaft, a chamber'enclosi-ng said gyratory roll shaft, upper and versal coupling: a frame having transverse members provided respectively With an upper supporting bearing and a lower bearing for said driving shaft, and driving means acting upon said driving shaft intermediate of said upper and lower bearings.

In testimony whereof We have signed our names to this specification.

WILLIAM A. GIBSON. CHARLES E. NEEDHAM. 

